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raocass roa rm: conversion or CIIBTAIN WATER PASTES INTO CERTAIN OIL PASTES.

. Specification of Beissued Letters Patent.

Reissued Mar. 7, 1922.

nonin Original no. 1,817,784, dated October 7, 1919, serial in. 25mm, fled October 11, 191:.

, Application for reissue fled September 80, 1921. -Serial 1i'o'. Y

To all wlwm 72 mg concern:

Be it known that I, HENRY Pn'mrn Fnn'rcnnn, a subject of the King of Great Britain, residing at Coogee, near Sydney, in the State of New South Wales, Australia, have invented certain new and useful Improvements in Processes for the Conversion of Certain -Water Pastes into Certain Oil Pastas, of which the following is a specification.

This invention relates to improvements in the manufacture of certain oil pastes and' has been devised in order that the water in gaste, such as Water astes in which (carbonates or su phates) is the base, maybe removed therefrom and oilsubstituted for the said water without nece$itating an intermediate drying operation and to'obtain a satisfactory commercial roduct.

In the production of certain oi pastes such asthat wherein precipitated whitelead is the base, the material under treatment assumes at one stage of manufacture the form of a wet pulp or water paste'from which (according to the processes heretofore generally used) it is necessary to remove the water and to permeate the material with oil, such as linseed oil. I

The salient feature of this invention re-. sides in the provision ofchemical and mechanical means whereby the pulp is permeated with oil to form an oil paste and the contained water is expelled without necessitating a distinct drying operation.

The wet pulp or water paste which is re quired to be converted into an oil paste is @treatedby the addition of apredetermined quantity of borate of manganese. The pro- -portion of borate of manganese to wet pulp would va within certain limits herein, after cleary defined according to the percentage of water contained in. the ulp, and the quantit of oil required to be incororated. hen treating thick pastes, that is pulp having a comparatively low water content the proportion vof borate of man-' 'anese added should be small, and when there are to be treated slush pastes that is tho having a comparatively highwater roportio'n of borate of manganese shoul be relatively higher.

The preferred proportion for pulp having sub j ect ing the mas.

a water content of approximately 20% by weight is 9 grains of borate of manganese to 1 pound of wet pulp, which corresponds to manganese in the pulp will saponify the oil.

To the ulp is also added the required quantity 0 oil and the mam is sub'ected to mechanical working and mixing, t e water being expelled. from the pulp and the oil combining therewith. About 8% of oil is a convenient and customary quantity for use.

the paste is of the required consistency. 7

For the purpose of carrying out the work-. ing. and mixing operation on a commercial scale any ordinary mechanical device or machine known in the art and found suitable may be employed, such as a machine of the dough-kneading and mixing type.

Instead of using borate of manganese as hereinbefore described, borax or other-boracic acid salts may be employed, ini which' case I prefer tovuse slightly more than nine grains as above described.

In'the example of wet pulp to be treated I have mentioned whitelead as an example, but the invention is not confined thereto. 1

What I do claim 1. The process for the con'ersion of water pastes in which white lead is the base into This workingor mixing is continued until i water paste boracic acid salts and oil, and" subjectmg the mass to mechanical working and mixing.

2. The process pastes in which white lead is the base, into oil pastes which consists in ad to the water paste borate of manganese an to' mechanical working and 1 mixing. 7

3. The processfor the conversion of water pastes in which white lead is the oil pastes which adding to the oi1,and V for the conversion of water base into water pasteboi'ate of Inanganese not exceedjng one half of one per cent by weight of the paste, and the required quentityof oil,

and subjecting the mass to mechanical work ing and mixing. 4. In a process for the converslon of water pastes in which White lead is the base into oil pastes, the subjecting of the Water paste tothe action of horate of manganese saidc borate of manganese being added in the proportionby weight of not exceeding one half of one per cent.

5. In a process for the conversion of water pastes of white lead carrying about 20% by Weight of water into oil pastes, the-subjects ing of the water paste to the actionfof horete of manganese, said borate of manganese being added in the proportion by Weight of between the limits of one-eighth end onehalfof vone per cent. 6. The herein described" process 3 which comprises mixing a. plup of white lead with a small elnountof e horate, then adding oil and Working the mass.

Henley PETRIE' FLETCHER. 

